Quote:
Originally Posted by Ryland
You also need to remember that if you have cooler air going in to your furnace to be heated that it's going to be able to pull more heat out of the furnace heat exchanger, so in theory at least your furnace is going to be more efficient with cooler air going in.
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It seems like sucking in real cold air to heat up, means you are going
to need more energy to get the job done. (Until the intake air is warm).
If the intake air was already a little warm, it's going to be easier
and faster to get the input air up to the requested setpoint.
My SUV gets 8 MPG on the hill near my house. But, on flat ground,
it can get 40 MPG (at 40 MPH).
It seems like any system is going to have to 'climb the hill', if it's
starting off trying to heat a real cold space..
But, if that space is not so cold.. There's not really a hill to climb. Just a bump.
So, you are driving on flat ground and getting good MPG, in short order.
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In these old oil burner forced-baseboard-hot-water heated houses
around here, when the burner comes on, it pulls cold outdoor air
into all the leaky windows in the basement.
And maybe a few upstairs. Kinda like when we use our electric clothes dryer.
All the air being pumped out, has to come from somewhere.
I like the Sanyo Mini-split ASHP, because it does not need to bring in any outside air.
Burning Oil is so dumb!! My oil burner is running 1/2 hour per day..
And making that hot bathing and washing water with oil is probably around 60 percent of my total energy bill. (Oil+Electric).
In this kind of weather of weather anyways..